Tubular rivet



Febzs, 1939. HEWANER 2,149,199

' TUBULAR RIVET Filed Aug. 13, 1936 nnnnn un K.

11127111AvrlllllllllllalllllllI/J IVI/lll Patented Feb. ze, 1939 I PATENT' oFFIcE TUBULAR RIVET lHarryE. Waner, Akron, Ohio, assigner to The B. F. .Goodrich Company, New York, N. Y., corporation of New York Application August 13, 1936, Serial No. 95H57 5 Claims.

This invention relates to tubular rivets. This application is a continuation in part of my application Serial No. 30,889, tiled Julyll, 1935 (now Patent No. 2,069,907).

.5 The problem of fastening articles to walls of thin sheet metal, especially where one side only of the she :t is available for operation, presents many diiliculties. The .thinness oi the metal sheet precludes the use of threaded screws except i for exceptionally light loads, and the threading o! the holes requires considerable expenditure oi time. On the other hand, ordinary rivets can not be applied in the absence oi any means for bucking the rivets from the opposite side of the l sheet. With'thin metals welding becomes impractical andwith certain metals such as aluminum soldering is practically impossible.

' vThe present inventionfaims to provide a tubular I fastening element whichmay be applied from Q0' one side only oi the sheet. y. j.

- The principal objects oil theinventiony are to provide anoveifsstening element.

Other objects will appear from the following."

i the rivet has been fully installed.

Fig. 2 is a perspective view partly in section of ga. preferred formy of the tubular rivet of my l3g; invention with the threaded draw rod inserted A -v therein.

Fig. 311s a sectional view similar to Fig. 1, with .prrts broken away, showing the second step in the procedure of installing the rivet. UD Fig. 4 is a section taken on line' 4-4 oi Fig. 3. Fig. 5 is a perspective view of a hollow article having a thin wall prepared to receive one of the rivets and with one of the rivets in place. Fig. 6 is a cross-sectional view thereof taken .a on line 6 6 o1' Fig. 5.

Fig. 7 is a similar view showing a bracket at tached to the rivet.

" Referring to the drawing the numeral II designates a thin wall of metal or other rigid material forming a part of a' hollow article accessible only from one side, to which it is desired to fasten other parts. ture therein comprising a circular opening having 55 va key way I2 as an extension thereof. Such aper- The numeral I I designates an aper.

tures may be formed in any desired manner to receive the tubular rivets oi this invention.

The rivet I3 comprises a tubular body having a flange Iii at one end and preferably formed with an integral key I5 for engaging the key way .5

I2 to prevent rotation of the rivet when it is in place. The opposite extremity of the rivet is threaded internally as at I6 to provide anchorage for a screw. The rivet between the threaded portion i6 and the end at the flange I4 is counter-l '.10 bored to reduce the wall thickness as compared with the threaded portion and provide a collapsible cylindrical portion i'l, as is' shown for example iii-Figs. 1 and 2. This construction, in which the bore of uniform diameter terminates in the threaded portion, has the advantage that the outward collapse or expansion ls effected uniiormlv aboutl the circumference without likelihood of a piling up of the metal at one side with deficiency at the other. is applied with circumferential uniformity by virtue'ot the threaded connection which assures uniform pressure application entirely around the rivet by the inserted threaded member used for collapsing the rivet. The cylindrical form of the g5 collapsible Wall gives maximum material in the bulge of the expanded rivet for maximum holding strength and water-tightness of the joint.

The tubular stem of the rivet is inserted through the aperture II with the flange against the outer surface of the wall. The rivet may then be shortened by endwise pressure so as to collapse the portion I'I as seen in Figs. 3 and 6, thereby forming a ange on each side of the metal wall IU. l

In order to accomplish such collapse of the rivet wall by operation from one side only of the wall, the apparatus employed is as follows:

A setting anvil I8, comprising a centrally bored iiat ended plug, is mountedin one end of a hol- 40 low tubular barrel I9. A draw rod 20 extending through the plug I8 is threaded at one end to engage the threads in the rivet I3. Its opposite end is fixed to a draw head 2I, as by being threaded therein and locked against rotation by a. screw 22. Draw head 2| is loosely enclosed by the barrel iii. A tubular cross head 24, slidably mounted in the barrel between the anvil I8 and the draw head 2i, is provided with trunnions 25, 25' which extend loosely through elongate 50 slots 2li, 2t formed in the barrel. A lever 21 hinged by a pin 23 to an ear 2d, formed on the side of the barrel is adapted to impart a longitudinal movement to the draw rod 2li, toward the anvil It, when the lever 2l is forced toward the 55 The endwise pressure 240 Y barrel. If the draw rod is engaged in the threads of the tubular rivet and the anged head of the rivet is against the anvil, as shown in Fig. 1,

and such movement of the lever is attempted, the portion I'I of the rivet will be collapsed as shown in Fig. 3.

In order conveniently to release the tool from the collapsed rivet, draw head 2l is attached, as

by a cross pin 29', to a shaft 30, extending lengthwise through the barrel I9 and secured to a crank 3| whereby the draw rod 20 may be screwed out of the rivet.

A coil spring 32, of the compression type, extending between a plug 33, through which the shaft 30 is journaled at the handle end of the barrel I9, and a collar 34, fixed to shaft 30 witiiin barrel I9, normally holds the draw rod in its advanced position. v

When the rivet is to be inserted in a wall of metal or Iother thin material, the rivet is screwed Ionto the advanced end of the draw rod until its flanged head meets the anvil. The rivet is then inserted in the aperture I I in the wall and while it is held with its flange thereagainst, lever 21 l -operated to collapse the rivet. 'I'he crank 3| is then turned to withdraw the draw rod.

As shown in Fig. 7 a bracket 35 or other attachment may be fastened to the rivet by a screw 36 inserted in the threaded bore of thel rivet.

The invention is especially useful where stay rods, De-Icer equipment, or other parts are to be fastened to the thin metal skin of aircraft. The rivets may be made of any soft metal such as aluminum or copper or their alloys.

I claim:

wall aperture and to be expanded outwardly in a portion thereof to hold the rivet against the ange at one end thereof, said body having a bore of substantially uniform diameter extending into the body` from the flanged end and terminating in a threaded portion adapted to be engaged by a threaded member inserted in the bore from the flanged-end of the rivet, the body between said threaded portion and the flanged end being adapted to be outwardly expanded by forces applied axially of the rivet by engagement of a threaded member with the screw threads to form a second flange at the face of the wall opposite that adjacent the said flanged end of the rivet.

2. A tubular rivetadapted to be inserted in a wall aperture and tobe expanded outwardly in a portion thereof to hold the rivet against the.

wall, said rivet comprising a contipuously annular cylindricalbody of substantially uniform outside diameterthroughout its length and a wall-engaging flange at one end thereof formed with a key element to seat in a recess in the 1. A tubular rivet adaptedto 'ne inserted in aA wall to prevent turning of the rivet, said body having a bore of substantially uniform diameter extending into the body from the anged end and terminating in a threaded portion adapted to be engaged by a threaded member inserted into the bore from the flanged end of the rivet, the body between said threaded portion and the iianged end being' adapted to be outwardly expanded by forces applied axially of the rivet by engagement of a threaded member with the screw threads toform a second flange at the face of the wall opposite that adjacent the said flanged end of the rivet.

3. A tubular rivet adapted to be inserted in a wall aperture and to be expanded in a portion thereof to hold the rivet against the wall, said lrivet comprising a continuously annular cylindrical body of substantially uniform outside diameter throughout its length and having a wall-engaging ange at one end thereof formers with a key element to engage the wail and to prevent turning of the rivet, the body including 'an internally threaded portion at the other end of increased wall thickness, and a collapsible wall portion between the flanged end and the threaded portion having a thinner wall adapted to be bulbed outwardly to form a second flange under pressure applied axially of the rivet, and a threaded screw member having a head at the flanged end of the rivet and a threaded portion adapted to extend into the rivet and to engage the thread? ed portion thereof to reinforce the rivet against forces tending to straighten the flanged portion. 4. A tubular rivet structure adapted to be in.- serted in a wall aperture and to be expanded in -a portion thereof to hold the structure against .the Wall, said structure comprising a flanged end, a screw-threaded portion and a continuously annular cylindrical wall portion of substantially unie form outside diameter extending from said flanged end to said screw-threadedportion, said cylindrical wall portion being thinner and of larger bore than the wall at said screw-threaded portion and being adapted to be expanded by pressure in the axial direction applied through the screw threads of the structure.

5. A tubular rivet structure adapted to be inserted in a wall aperture and to be outwardly collapsed in a position thereof to hold the structure against the wall, said structure comprising a anged end, a bore of substantially uniform diameter extending i1 Lo the structure from the flanged end and ter ating in a threaded portion of less internal diameter, said threaded portion being adapted to be engaged by a threaded member inserted from the flanged end, and a continuously annular relatively thin cylindrical Wall portion deflning said bore of uniform diameter adapted to be expanded by axial pressure applied through screw threads of the rivet structure.

I HARRY E. WANER.

Eil 

